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Air trip - math puzzle
| At the same time two planes depart from JFK international airport. One plane flies exactly in northern direction, while the other one flies exactly to the east. Both planes fly at the same speed and at the same height. Which plane is after one hour the most far away from JFK? |
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2 x 2 = 2 + 2 - math puzzle
| Two times two is equal to two and two. But are there more number pairs for which the sum of the numbers is is equal to the product of the numbers? The numbers may be different. |
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Chess-board - math puzzle
| How many different squares are located on a chess-board? |
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